помогите 2 задание пожалуйста

1) is jake singing? No he isn't.
2) are robert and peter playing on the compute? Yes, they are.
3) is the dog biting the armchair? Yes, it is.
4) is sandy playing the piano? No, she isn't. She is playing on the guitar.
5) are jake and tom jumping on the sofa? Yes, they are.